To reproduce: * Download the dev/1 branch of https://github.com/dcycle/docker-compresspdf * Run ./test.sh The result is: ... import os, datetime, sys, glob, re, subprocess, pyprind, time ModuleNotFoundError: No module named 'pyprind' Even though in the [Dockerfile](https://github.com/dcycle/docker-compresspdf/blob/dev/1/Dockerfile) I am clearly installing pyprind. Any help on debugging this is greatly appreciated.